油菜田节肢动物群落结构及其模糊聚类分析

田间系统调查结果表明，油菜田全生育期节肢动物种类丰富，共记录52种，分属10目32科。同翅目昆虫的相对丰盛度最高，为0. 823,其次为双翅目昆虫，相对丰盛度为0.114。模糊聚类分析结果表明，不同时间油菜田节肢动物群落可分为4类，分别为群落建立阶段的动态类型，节肢动物大量迁入阶段的动态类型，蚜虫大发生阶段的动态类型和相对稳定阶段的动态类型。

Structure of arthropod community in rape fields and its fuzzy cluster analysis

An investigation was made on the structure of arthropod community in rape fields and used fuzzy cluster analysis to analyses the results.The results showed that the species of arthropods were rather rich in rape fields during the whole growth and development period of rape .There were 52 species of arthropods belonging to 32 families and 10 orders.The Homoptera had the greatest relative abundance with the relative abundance index of 0.823, and next came the Dipterans with the index of 0.114.The results of fuzzy cluster analysis showed that the arthropod communities in rape fields in time sequence could be classified into 4 types as the dynamic type of community establishment period, the dynamic type of mass arthropod immigration period, the dynamic type of severe aphid occurrence period and the dynamic type of relatively stable period.It coincided with the ecological adaptability of arthropods and the regularity of outbreak of advantage pest.